Family name 四郎 (四郎 
, Shirō) , in the entire world, is a very rare cognomen. The cognomen 四郎 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 四郎 is the forename as well as the last name.
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皆川 四郎 JP (b. 1852) |
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| 諸井 四郎 Japanese businessman, JP (b. 1869) |
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| 窪田 四郎 JP (b. 1873) |
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| 井染 四郎 Japanese actor (1907-1943), JP (b. 1907) |
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| 久野 四郎 Japanese actor, JP (b. 1927) |
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